Applies to:

Reduce the volume level on the connected Aux device. Some devices might output too strong of a signal with their volume level set high or to the maximum. This can cause poor and distorted audio from connected speakers

Go into the sound settings of the connected device and set any equalisation and audio processing settings to "off" or "flat"

Make sure the 3.5 mm plug is fully and securely inserted into both the device and the speaker

The issue could be related to the audio cable. Try a new cable

Try playing another source on the device. For example, try another music app to see if the issue is with a particular app

Try playing another source on the device. For example, try another music app to see if the issue is with a particular app

The issue could be with the connected Aux device. Try another audio device

Reboot the connected device. This is typically done by turning it off completely and then restarting it